It Seems That I've Slipped Into a Different World. Also, My Gender Has Changed. - Chapter 73: Good Job, Information Gathering while Having A Tea

She is the underworld Ghost Doctor’s only disciple, who accidentally transmigrated into the body of the main wife’s daughter in the general’s mansion. She used to be a punching bag.Now, she stepped on her dregs of an older sister, put her father’s concubine in her place, and teaches any objectionable aristocratic ladies a lesson.

Her days are rather free and unfettered. But when did that cold as ice prince from the rumors, sporting a deadpan face all day long, fix his gaze on her?
He unexpectedly fawned and pandered to her like a devoted dog?

“Go away, you rotten man! Careful or I’ll needle you like a pin cushion!”

“Wife, why are you so fierce? As a husband, I’m so scared”
….the man is all smiles as he approached, his eyes gleaming with a cunning light.

- Description from Novelupdates

Golden scales do not belong to the shallows; once they encounter the storm and clouds, they transform into a dragon!On his wedding night, Su Luo faced betrayal by his brothers and his wife. In a desperate situation, he received the legacy of Cultivation.He cultivated peerless celestial techniques, controlled life and death with Yin and Yang, grabbed destiny against the heavens, met a confidant of stunning beauty, and from thereon, he became undefeated by the world!This world, because of his existence, shivered!

The protagonist is an accidental time traveler - he didn't wait, didn't guess, only dreamed, but ended up in history, which he didn't pay much attention to. He was just lucky with his lineage.Ryo is a new member of the Nara clan, from the Uzumaki lineage on his father's side, and it so happened that he was born not at the beginning of the known plot, but more than three decades and two world wars later. Now he has to figure out how to get out of this situation however he can.

He—an enigmatic and cold-blooded soldier with a mysterious background.
She—a ruthless and bloodthirsty spy.